08-02-2021, 05:59 AM
(08-02-2021, 05:11 AM)Whoops_imp Wrote:(07-31-2021, 06:49 PM)Tev62_imp Wrote:(07-30-2021, 09:07 PM)Cormanus_imp Wrote: That makes sense, Tev62. The issue here is whether the profile of the OEM 140/70 and the 160/60 result in different diameters. As I recall, they don’t so there should be no speedo variation other than that you describe.
Yep, I get what you are saying, like for like there should be very little difference in the aspect ratio, 2mm is the only difference there, minimal impact.
60% of 160 = 96 and 70% of 140 = 98
Yep, I get what you are saying, like for like there should be very little difference in the aspect ratio, 2mm is the only difference there, minimal impact.
60% of 160 = 96 and 70% of 140 = 98
At the risk of sounding like a mechanical idiot, I was curious how the odometer calculates mileage. In other words, is it based on tire revolutions (i.e. diameter) or does it work off engine revolutions? Just wondering if a different tire size could potentially cause miles to accumulate faster or slower as a result of non-OEM tire sizes.
Whoops, I AM a mechanical idiot, but I don't ride like one lol. The speed I'm assuming is calculated somehow off the speed ring on the wheel? The odometer off something else?
The question is how big of a difference does it make and that is something I can't answer but certainly something that I don't worry about. Some people will spend big bucks on a speedo healer to make sure their speedo matches a GPS reading. For me unless it was waaay off, like 10-15 mph off, it's no big concern.
If a stock tire gets smaller as it wears, and we know it does, does it worry you that the speedo and odometer are also going to be increasingly off? Are they off high or low? Does a one size larger tire when new, and gets smaller with wear, does it become closer or further away from being accurate as it wears?
Too much to worry about. I'd rather just ride lol.